exxos wrote: ↑Tue Oct 17, 2023 9:42 am
I don't get why ram always fails. Though on the falcon the signals were really bad and I started to design a ram board with filtering.. but nobody would likely buy it because nobody understands how common ram failure is
It's odd, it's been running fine, but I haven't used it in a while, so I can only assume one of the ICs on the SIMM failed when it was powered up.
Easy enough to find the faulty SIMM using the diag cart, but annoying nonetheless. What was more scary was the worry of breaking the latches that hold the SIMMs in place, but I managed OK and none broke.
My recent Spectrum boards had so much bad RAM it was ridiculous. I can see why the 4116's fail, as if the power circuit goes bad, you can get high voltages on the 12v side that will kill them, and I had a 50% fail rate (Same in the TRS-80 with 4116 RAM). But for the upper RAM, they don't use 12v, only 5v, but I still had a 40% fail rate for the upper RAM.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...